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    Wyświetlanie 1-8 z 8
    Tytuł:
    Phyllotactic pattern formation in early stages of cactus ontogeny
    Autorzy:
    Gola, E M
    Powiązania:
    https://bibliotekanauki.pl/articles/59078.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    phyllotactic transformation
    pattern formation
    early stage
    cactus
    Cactaceae
    ontogenesis
    phyllotaxis
    Opis:
    Representatives of the family Cactaceae are characterized by a wide range of phyllotaxis. To assess the origin of this diversity, early stages of phyllotactic pattern formation were examined in seedlings. The analysis of the sequence of areole initiation revealed intertribal differences. In seedlings from the Trichocereeae (Gymnocalycium, Rebutia) and Notocacteae (Parodia) tribes, two opposite cotyledonal areoles developed as the first elements of a pattern. Usually, next pair of areoles was initiated perpendicularly to cotyledonal areoles, starting the decussate pattern. This pattern was subsequently transformed into bijugate or into simple spiral phyllotaxis. In seedlings from the Cacteae tribe (Mammillaria and Thelocactus), cotyledonal areoles were never observed and the first areoles always appeared in the space between cotyledons. It was either areole pair (mainly in Mammillaria), starting a decussate pattern, or a single areole (mainly in Thelocactus) quickly followed by areoles spirally arranged, usually in accordance with the main Fibonacci phyllotaxis. Differences in the initial stages of pattern formation do not fully explain the phyllotaxis diversity in mature cacti. Only two, the most common phyllotactic patterns occurred in the early development of studied seedlings, i.e. the main Fibonacci and the decussate pattern. Discrepancy in the range of phyllotactic spectra in seedlings and in mature plants suggests that phyllotaxis diversity emerges during further plant growth. Initial phyllotactic transformations, occurring already in the very early stages, indicate great plasticity of cactus growth and seem to support the hypothesis of the ontogenetic increase of phyllotaxis diversity due to transformations.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2006, 75, 4; 271-279
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diversity of phyllotaxis in land plants in reference to the shoot apical meristem structure
    Autorzy:
    Gola, E.M.
    Banasiak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/56987.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Regularity and periodicity in the arrangements of organs in all groups of land plants raise questions about the mechanisms underlying phyllotactic pattern formation. The initiation of the lateral organs (leaves, flowers, etc.), and thus, their spatio-temporal positioning, occurs in the shoot apical meristem (SAM) and is related to the structure and organogenic activity of the meristem. In this review, we present some aspects of the diversity and stability of phyllotactic patterns in the major lineages of land plants, from bryophytes to angiosperms, in which SAM structures differ significantly. In addition, we discuss some of the possible mechanisms involved in the formation of the recurring arrangement of the lateral organs.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vascular structure contributes to shoot sectoriality in Selaginella kraussiana
    Autorzy:
    Gola, E.M.
    Jernstedt, J.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/59334.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Selaginella species are characterized by regular anisotomous dichotomous divisions of the shoot apical meristem, giving rise to two new axes (branches) which differ in size. A vital process is the formation of vascular connections, which enables continuous communication and consequent functional and developmental integration of a plant during branching. Here, we present the sequence of developmental changes in the vascular system of Selaginella kraussiana related to dichotomous branching. Stem vasculature in Selaginella kraussiana consists of two meristeles which change in arrangement during shoot development. Using dye tracers, we documented developmental functional isolation of meristeles associated with the specific structure of the stelar system, which results in a spatiotemporal sectoriality of the shoot. We discuss sectoriality in terms of possible significance for shoot development.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological variability of Helleborines. I. Diagnostic significance of morphological features in Epipactis helleborine (L.) Crantz, Epipactis atrorubens (Hoffm.) Besser and their hybrid, Epipactis x schmalhausenii Richt. (Orchidaceae, Neottieae)
    Autorzy:
    Jakubska-Busse, A.
    Gola, E.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/56652.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    morphological variability
    Helleborines
    diagnostic significance
    morphological feature
    Epipactis helleborine
    Epipactis atrorubens
    hybrid
    Epipactis x schmalhausenii
    Orchidaceae
    Neottieaeleaf
    plant morphology
    papilla
    hybridization
    Opis:
    The comparative analysis of leaf morphology was performed in E. helleborine (L.) Crantz, E.atrorubens (Hoffm.) Besser, and their interspecific hybrid, Epipactis ×schmalhausenii Richt. The aim of this research was to find out features that would be useful in the taxonomy of the genus Epipactis, and particulary their taxa of hybrid origin. In course of the studies special attention was paid to leaf morphology, mostly to their margins, presence of papillae, their shape and size, and to leaf structure. The thickness of the leaf blades manifested by number of spongy mesophyll cell layers, size of vascular bundles and the level of leaf sclerification were compared in the hybrid and both parental species. In E. helleborine and E. atrorubens the analyzed features were highly variable, especially in the former species, which is characterized by wide phenotypic plasticity. Morphological and anatomical features in E. ×schmalhausenii showed a transitional character to the parental species. Our results suggest that a single feature can not be of taxonomic value, but the combination of different traits has to be considered when distinguishing parental and hybrid taxa.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2010, 79, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    It is worth checking old data – validation of Asplenium onopteris L. presence in the most northeastern sites in Europe (Sudetes, SW Poland)
    Autorzy:
    Szczesniak, E.
    Gola, E.M.
    Jedrzejczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/59225.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    In Poland, isolated serpentine rocks are exclusive habitats of some Asplenium species, reaching here their north or northeastern border range. One of them was Asplenium onopteris, a diploid European species native to Mediterranean and Atlantic areas. Since the nineteenth century, Polish out-of-range sites of A. onopteris have been quoted in literature without critical verification. Thus, to verify occurrence of this species in Poland, we analyzed the nuclear DNA content and micromorphological features as well as critically reviewed the literature data. We proved that all individuals from Polish populations resembling A. onopteris were tetraploids and should be classified as A. adiantum-nigrum. In addition, we validated a taxon silesiacum reported as co-occurring with A. onopteris. The proposed diagnostic features are insufficient to indisputably delimit this taxon, and distinguishing it as a separate unit is not justified. Analyses of the DNA content revealed also the presence of a triploid A. ×centovallense, a new hybrid for Polish flora.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2017, 86, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A predictive model of multi-stage production planning for fixed time orders
    Autorzy:
    Kozłowski, E.
    Terkaj, W.
    Gola, A.
    Hajduk, M.
    Świć, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/407278.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    production planning
    faulty parts predictability
    mathematical model
    linear quadratic control
    Opis:
    The traditional production planning model based upon a deterministic approach is well described in the literature. Due to the uncertain nature of manufacturing processes, such model can however incorrectly represent actual situations on the shop floor. This study develops a mathematical modeling framework for generating production plans in a multistage manufacturing process. The devised model takes into account the stochastic model for predicting the occurrence of faulty products. The aim of the control model is to determine the number of products which should be manufactured in each planning period to minimize both manufacturing costs and potential financial penalties for failing to fulfill the order completely.
    Źródło:
    Management and Production Engineering Review; 2014, 5, 3; 23-32
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Np-237 incineration study in various beams in ADS setup QUINTA
    Autorzy:
    Kilim, S.
    Strugalska-Gola, E.
    Szuta, M.
    Bielewicz, M.
    Tyutyunnikov, S. I.
    Furman, W. I.
    Adam, J.
    Stegailov, V. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146295.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Np-237
    accelerator-driven system
    ADS
    gamma-ray spectrometry
    fission
    neutron capture
    Opis:
    Neptunium-237 samples were irradiated in a spallation neutron fi eld produced in accelerator-driven system (ADS) setup QUINTA. Five experiments were carried out on the accelerators at the JINR in Dubna – one in carbon (C6+), three in deuteron, and one in a proton beam. The energy in carbon was 24 GeV, in deuteron 2, 4 and 8 GeV, respectively, and 660 MeV in the proton beam. The incineration study method was based on gamma-ray spectrometry. During the analysis of the spectra several fi ssion products and one actinide were identifi ed. Fission product activities yielded the number of fi ssions. The actinide (Np-238), a result of neutron capture by Np-237, yielded the number of captures. The main goal of this work was to fi nd out if and how the incineration rate depended on parameters of the accelerator beam.
    Źródło:
    Nukleonika; 2018, 63, 1; 17-22
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dermacentor reticulatus (Fabricius, 1794) and Babesia canis (Piana et Galli-Valerio, 1895) as the parasites of companion animals (dogs and cats) in the Wroclaw area, south-western Poland
    Autorzy:
    Krol, N.
    Kiewra, D.
    Lonc, E.
    Janaczyk, B.
    Chodorowska-Skubiszewska, A.
    Dzieciol, M.
    Gola, M.
    Gruszka, R.
    Jackowska-Szlachcic, E.
    Jagiello, M.
    Kawski, S.
    Lukaszewski, Z.
    Mizgalski, P.
    Narajowska, T.
    Niedzielska, J.
    Noczynski, M.
    Rudkowska, M.
    Rzepka, D.
    Samulska, K.
    Senze, M.
    Sieczko, P.
    Silny, A.
    Staniewska, A.
    Stanczyk, J.
    Stanczyk, W.
    Stasiak, M.
    Wlodarczyk, M.
    Zimniak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/6581.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Opis:
    Tests performed in 2013 and 2014 revealed the occurrence of three tick species parasitizing pet cats and dogs in the Wrocław Agglomeration. In total, 1,455 tick specimens were removed from 931 hosts (760 dogs and 171 cats) in 18 veterinary clinics. The dominant tick species was Ixodes ricinus (n=1272; 87.4%), followed by I. hexagonus (n=137; 9.4%) and Dermacentor reticulatus (n=46; 3.2%). Females were the most often collected development stage among I. ricinus and D. reticulatus, and nymphs among I. hexagonus. Additionally, D. reticulatus ticks (n=337) were then collected from vegetation in the Wrocław area to detect Babesia canis; however, none was found positive. Only 9.0% of dog blood samples sent to VETLAB were positive for Babesia spp. Negative results for B. canis from ticks may result from the short period of the occurrence of D. reticulatus in the Wrocław area and therefore the vectorpathogen cycle may not have been fully established at the time of the study. Nevertheless, D. reticulatus is expanding its range, and the size of its population in the Wrocław Agglomeration is increasing. The presence of the pathogenic Babesia spp. combined with the occurrence of its main vector¸ D. reticulatus, suggests that the epizootiological situation in the area can change and may pose a new veterinary problem in the future.
    Źródło:
    Annals of Parasitology; 2016, 62, 2
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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